*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
html,body{
    height: 100%;
}
body{
    display: flex;
    flex-direction: column;
}
header{
    width: 100%;
    height: 1.74rem;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
}
header>div:first-of-type{
    width: 100%;
    height: 0.64rem;
    background-color: rgb(243, 26, 26);
}
header>div:last-of-type{
    width: 100%;
    height: 1.1rem;
    background-color: rgb(231, 190, 56);
}
/* banner开始 */
.banner{
    width: 100%;
    height: 2.1rem;
}
.banner img{
    width: 7.1rem;
    height: 1.76rem;
    border-radius: 5px;
}
/* dong开始 */
.dong{

}